Gun Metal Grey is a 2010 Hong Kong police procedural television serial drama starring Felix Wong and Michael Miu. Produced by Terry Tong and edited by Lau Choi-wan and Leung Yan-tung, Gun Metal Grey is a TVB production. The drama is one of two grand TVB productions to celebrate the channel's 43rd anniversary, the other being No Regrets, and they are the first Hong Kong dramas to broadcast with English subtitles. The Chinese title literally means "criminal police". During early promotions for the drama, the year "2010" was attached to the Chinese title to prevent confusion with previous dramas of a similar title. The English title is a word play on the colour of guns, a representation of criminal justice, and Felix Wong's character Stone Sir, a cop who finds himself trapped in a grey area of morality.